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Company lists · Data refreshed September 2026

Top 25 Search marketing agencies based in London, United Kingdom

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 2,780 companies tracked

RevenueBase identified 2,780 search marketing agencies headquartered in London, United Kingdom as of September 2026 and tracks 22,364 professional contacts across them, including 2,628 with verified work emails. London is the largest hub.

This list covers search marketing agencies headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 6, 2026 86% judged on-target in blind review
2,780Companies
22,364Contacts tracked
2,628Verified emails
Explore all 2,780 companies → Free signup · no credit card · 500 free credits

The 25 largest search marketing agencies based in London, United Kingdom

Ranked by team size
Top 25 of 2,780 search marketing agencies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 6, 2026. Evidence rates how directly each company's own description names search marketing agencies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
M C Saatchi PerformanceIndirect evidence
London, United KingdomHQ checked Sep 6, 2026201-500457

“We are a Global digital media agency specializing in taking a human approach to connecting brands with people across all channels.”

Source: company website · checked Sep 6, 2026
2
BIG GroupIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-200177

“Founded in 1991, with offices in Amsterdam, Bath, Dubai and London our award-winning employee-owned company has consistently ranked as one of the UK's leading independent digital…”

Source: company website · checked Sep 6, 2026
3
Investis DigitalIndirect evidence
London, United KingdomHQ checked Sep 6, 2026501-1,000158

“IDX (formerly Investis Digital) specializes in elevating companies and brands and maximizing technology to build strong, relatable, and authentic connections with their audiences.”

Source: company website · checked Sep 6, 2026
4
AdthenaPartial evidence
London, United KingdomHQ checked Sep 6, 202651-200123

“Adthena is the market-leading, AI-driven search intelligence platform that helps enterprise brands and agencies lower paid search costs, protect brand equity and stay ahead of…”

Source: company website · checked Sep 6, 2026
5
E IntelligencePartial evidence
London, United KingdomHQ checked Sep 6, 202651-200117

“e intelligence is a renowned global leader in the digital marketing space.”

Source: company website · checked Sep 6, 2026
6
FOUNDIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-200104

“We're Found, the Everysearch™ agency.”

Source: company website · checked Sep 6, 2026
7
FinixioPartial evidence
London, United KingdomHQ checked Sep 6, 202651-20096

“Finixio is UK based remote first Marketing & SEO Agency helping clients all over the world.”

Source: company website · checked Sep 6, 2026
8
The Media PeopleIndirect evidence
London, United KingdomHQ checked Sep 6, 202611-5083

“Powered by our people, our campaigns put your audience first.”

Source: company website · checked Sep 6, 2026
9
Social BoostIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20079

“Social Boost has helped to grow more than 25 million real Followers, created content for 100+ brands, and generated over 300k sales leads.”

Source: company website · checked Sep 6, 2026
10
MediavisionPartial evidence
London, United KingdomHQ checked Sep 6, 202611-5077

“At MediaVision, we believe there's potential hidden in every search.”

Source: company website · checked Sep 6, 2026
11
Mind Digital GroupIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20076

“Mind Digital Group is an independent digital company that is focused on servicing global clients and partner agencies.”

Source: company website · checked Sep 6, 2026
12
GA AgencyPartial evidence
London, United KingdomHQ checked Sep 6, 202651-20070

“GA Agency is an award-winning digital marketing agency helping brands all over the world grow their business and revenue in the online space.”

Source: company website · checked Sep 6, 2026
13
ClickscoIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20066

“As a new chapter in our Digital Agency begins, we are also a fantastic place to work, with a reputation for discovering and nurturing some of the finest minds in the business…”

Source: company website · checked Sep 6, 2026
14
Eureka DigitalPartial evidence
London, United KingdomHQ checked Sep 6, 202651-20065

“Eureka Digital is a multi-award-winning digital marketing agency specializing in healthcare and pharmaceuticals.”

Source: company website · checked Sep 6, 2026
15
77agencyIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20064

“We are an award-winning full-service digital agency, part of Jakala group with 1,800 employees across 16 countries around the world.”

Source: company website · checked Sep 6, 2026
16
KaizenIndirect evidence
London, United KingdomHQ checked Sep 6, 202611-5061

“kai-zn] noun continuous improvement | positive change We’re experts in organic strategy, combining digital PR, technical SEO, content, and social media to put you in front of your…”

Source: company website · checked Sep 6, 2026
17
ROASTIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20057

“We are ROAST.”

Source: company website · checked Sep 6, 2026
18
RebootIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20057

“Get found online.”

Source: company website · checked Sep 6, 2026
19
MEMOPartial evidence
London, United KingdomHQ checked Sep 6, 202611-5052

“MeMo is an integrated agency at the cutting edge of hospitality marketing.”

Source: company website · checked Sep 6, 2026
20
Suso DigitalPartial evidence
London, United KingdomHQ checked Sep 6, 202611-5052

“SUSO Digital is an award-winning SEO and AI Search agency.”

Source: company website · checked Sep 6, 2026
21
SKALEPartial evidence
London, United KingdomHQ checked Sep 6, 202651-20051

“Skale is an AI-search-first organic growth agency for SaaS and tech brands.”

Source: company website · checked Sep 6, 2026
22
ADAPTIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20049

“Adapt helps global brands deliver campaigns that convert, by blending data-driven growth strategies with localisation expertise.”

Source: company website · checked Sep 6, 2026
23
Stellar SearchStrong evidence
London, United KingdomHQ checked Sep 6, 202611-5048

“We're a strategic digital marketing agency specialising in Paid Search, SEO, Google Shopping, Amazon and Social.”

Source: company website · checked Sep 6, 2026
24
Harvest DigitalIndirect evidence
London, United KingdomHQ checked Sep 6, 202611-5048

“We are a leading independent digital media agency.”

Source: company website · checked Sep 6, 2026
25
Digitex TechnologiesPartial evidence
London, United KingdomHQ checked Sep 6, 202651-20046

“Bringing our 10+ years of experience and knowledge of digital marketing, Digitex Technologies has now become almost synonymous with SEO, social media marketing, website building…”

Source: company website · checked Sep 6, 2026

Showing 25 of 2,780 search marketing agencies based in London, United Kingdom

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Search marketing agencies based in London, United Kingdom at a glance

As of Sep 6, 2026
1-10Median size (employees)
LondonLargest hub · 2780 HQs
Contacts with mobile numbers
Sep 6, 2026Data refreshed

Companies by employee count

1-10
1,898
11-50
733
51-200
118
201-500
15
501-1,000
6
1,001-5,000
3
5,001-10,000
2
10001+
1

Email recency for this list is measured across the whole United Kingdom list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for London, over 2,780 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among search marketing agencies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in London, United Kingdom whose own description of what they do matches “search marketing agencies”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among search marketing agencies, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 2,628 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 6, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Search marketing agencies by metro in the United Kingdom

Frequently asked

How many search marketing agencies are there based in London, United Kingdom?

RevenueBase identified 2,780 search marketing agencies headquartered in London, United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

M C Saatchi Performance, headquartered in London, tops this list with the largest team on record.

Which city has the most search marketing agencies?

London leads with 2780 headquartered companies, followed by Manchester (358) and Birmingham (239).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,628 verified decision-maker contacts tracked across these 2,780 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 6, 2026.

Ready to reach these companies? Verified emails and direct dials for all 2,780 search marketing agencies based in London, United Kingdom. Start with a free account, no credit card.

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Related lists

Browse: Companies home · Search marketing agencies in United Kingdom · All United Kingdom lists · All Search marketing agencies lists · New lists

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.

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